Product Description

Nitrogen + 24% Sulfur — a Feed and Soil Acidifier for Acid-Loving Plants

Old Cobblers Farm Ammonium Sulfate is an acid fertilizer that does two jobs: it feeds plants nitrogen and sulfur, and it gradually lowers soil pH — which makes it a classic choice for acid-loving plants such as azaleas, rhododendrons and blueberries, and for gardeners working with alkaline soils. The analysis is about 21% nitrogen with 24% sulfur, and the formula is 100% water-soluble for quick uptake.

The nitrogen supports green, leafy growth and rich color, while the sulfur is both a plant nutrient and the driver of the soil-acidifying effect. That acidification is gradual — it happens as the ammonium converts in the soil — so it works best alongside a soil test rather than as an instant pH change.

Because it is high in nitrogen and fully water-soluble, it is fast-acting and easy to over-do. Apply it at the label rate, keep it off foliage, and water it in thoroughly right after applying to move it into the soil and reduce the risk of fertilizer burn. Used with that care, it is a versatile feed for trees, shrubs, flowers, vegetables and lawns.

Where to use it: acid-loving plants (azaleas, rhododendrons, blueberries), alkaline soils that need lowering, and as a nitrogen-plus-sulfur feed for trees, shrubs, flowers, vegetables and lawns.

Key Benefits

• Lowers Soil pH: Gradually acidifies soil — ideal for acid-loving plants and alkaline soils.

• 24% Sulfur: Supplies sulfur as a nutrient and drives the soil-acidifying effect.

• Nitrogen for Green Growth: About 21% nitrogen supports green, leafy growth and rich color.

• 100% Water-Soluble: Dissolves fully for quick uptake by roots and foliage.

• For Acid-Loving Plants: A go-to for azaleas, rhododendrons and blueberries.

• Versatile Feed: Use on trees, shrubs, flowers, vegetables and lawns.

• Single Ingredient: 100% ammonium sulfate — a straightforward nitrogen-and-sulfur source.

Best Uses

• Acid-loving plants (azaleas, rhododendrons, blueberries)

• Alkaline soils that need lowering

• Nitrogen-plus-sulfur feeding for trees and shrubs

• Flowers, foliage and vegetables needing nitrogen

• Lawns needing nitrogen and sulfur

• Gardeners managing soil pH with a soil test

Important Notes / Safety

• Soil Test First: Acidification is gradual — test your soil and adjust pH based on need, not by guesswork.

• Water In to Reduce Burn: It is high-nitrogen and fully water-soluble, so it can burn if misused. Keep granules off foliage and water in thoroughly right after applying.

• Don’t Over-Apply: More is not better — follow the label rate. Excess nitrogen can scorch plants and can delay flowering and fruiting.

• Drives Green Growth: Nitrogen feeds leafy growth — this is not a bloom or fruit booster; pair with a balanced or higher-phosphorus feed if flowering is your goal.

• Conventional Mineral Fertilizer: This is a conventional product (ammonium sulfate), not an organic fertilizer.

• Storage & Safety: Store cool, dry and sealed. Wash hands after handling, and keep out of reach of children and pets.

Why Choose Old Cobblers Farm™?

Ammonium sulfate is a simple, dependable way to do two things at once: feed nitrogen and sulfur, and gradually acidify soil for acid-loving plants. We keep the claims honest — it greens up leafy growth and lowers pH over time; it is not a guaranteed bloom or fruit booster. Apply at the label rate and water in. (We describe how to use the product, not guaranteed results.)

Application Instructions

-Rate: follow the label — ammonium sulfate is applied at low rates because it is high-nitrogen and water-soluble (rate not given in the supplied copy — confirm)
-Acid-loving plants: apply around the root zone per the label, then water in
-Method: spread evenly and keep off foliage, or dissolve and apply as directed
-Watering: water in thoroughly right after applying to reduce burn risk
-Timing: during the growing season, per the label
Step by step
1. Test your soil first — especially if you are managing pH for acid-loving plants.
2. Apply at the label rate (low rates — it is high-nitrogen and water-soluble).
3. Spread evenly and keep granules off foliage, or dissolve and apply as directed.
4. Water in thoroughly right after applying to move it into the soil and reduce burn.
5. For acid-loving plants, apply around the root zone.
6. Reapply per the label during the growing season — do not over-apply.
What not to do
Do not over-apply or skip watering in (high-nitrogen and water-soluble means a real burn risk), do not apply to wet foliage in hot conditions, and do not expect an instant pH change — acidification is gradual.

Ingredients

Ammonium Sulfate (100%) — The single ingredient — supplies nitrogen and sulfur and gradually acidifies soil.

Total Nitrogen (N) — ~21% — Supports green, leafy growth and rich color (confirm exact % from the label).

Sulfur (S) — 24% — A plant nutrient that also drives the soil-acidifying effect.

Product Specifications

-Type: ammonium sulfate (nitrogen + sulfur fertilizer / soil acidifier)
-Analysis: ~21-0-0 with 24% sulfur (confirm N% from label)
-Ingredient: 100% ammonium sulfate (single ingredient)
-Solubility: 100% water-soluble
-Role: nitrogen feed + soil acidifier for acid-loving plants
-Burn risk: higher — water in thoroughly, don’t over-apply
-Best for: azaleas, rhododendrons, blueberries; trees, shrubs, veg, lawns